Navigation system, method and device with automatic next turn page

ABSTRACT

Systems, devices and methods are provided for an improved navigational route planning device which provides more understandable, accurate and timely information for negotiating a decision point along a route. The navigational aid device includes a processor adapted to communicate with a memory. The memory has cartographic data and a route to a desired destination stored therein. The cartographic data includes data indicative of thoroughfares of a plurality of types. A display is provided which is adapted to communicate with the processor and the memory and which is capable of displaying the cartographic data. The device processes travel along the route. The device recognizes when the device is approaching a decision point in the route and provides to the display an overlay screen on top of any presently displayed screen, the overlay screen adapted to display a preview of a decision point.

CROSS REFERENCE TO RELATED APPLICATIONS

This application is related to the following co-pending, commonlyassigned U.S. patent applications: “Navigation System, Method and Devicewith Voice Guidance,” Ser. No. 10/029,732 which are filed on even dateherewith and each of which disclosure is herein incorporated byreference.

FIELD OF THE INVENTION

The present invention relates generally to navigational devices, and inparticular to navigational devices with an automatic next turn page.

BACKGROUND OF THE INVENTION

Route planning devices are well known in the field of navigationalinstruments. The method of route planning implemented by known prior artsystems depends on the capabilities of system resources, such asprocessor speed and the amount and speed of memory. As increased systemcapability also increases system cost, the method of route planningimplemented by a navigation device is a function of overall system cost.

One feature of increased system capability cost involves the amount ofassistance provided at decision points. Many conventional navigationaldevices simply do not incorporate added assistance at decision points.Thus, as a user of such a device may often get turned around or confusedin unfamiliar territory. This is complicated by the fact that thecircumstances such as traffic conditions, such as highway or inner citytraffic conditions, often do not allow a user to pause and carefullyconsider a course of action at the decision point.

Conventionally, commercial auto clubs such a AAA® provide instructionsfor a course of action at various decision points, but without any realtime added guidance or assistance for the same. Typically, the recipientof these services is provided with a set of paper maps, some evenhighlighting the route. However, the individual navigating the routemust repeatedly flip through and study these maps before their traveland again in route. Extra attention must be given to these maps when thetraveler reaches decision points in their journey. This places the userback in a compromising position when in heavy traffic conditions, asmentioned above. Even more, without self initiated independent study,the user is not provided with any sort of advance notice or warning forwhen these decision points are approaching. Thus, without carefulplanning the user can easily miss the decision point or not affordthemselves with enough advance notice to be in the right position tonavigate a course through the decision point.

On line map services such as MapQuest® provide similar sets ofinstructions for a course of action at decision points along a route,but again without any real time added guided or assistance for the same.The users of these systems also print out paper maps which they mustflip through and in a self initiated independent fashion negotiate.

Finally, some navigation devices may attempt to provide a user withnavigational aids for decision points while traversing a planned route.However, these systems, particularly low cost free standing navigationsystems, limit such assistance to precanned bitmaps of symbols. Forexample, these systems may provide a turn arrow symbol indicating adirection to take at a decision point. While precanned bitmapnavigational aids may be helpful in some instances, they generally donot provide enough instructional aid to a user in unfamiliarsurroundings, particularly in a congested network of thoroughfares.Moreover, these devices do not provide any added assistance to negotiateamong the many courses of action which match the instruction of theprecanned bitmap symbol in a crowded network of thoroughfares. In otherwords, a left turn arrow symbol does not assist a user to understandwhich of several immediately approaching left turns to take.

In summary, existing navigation devices do not provide user intuitiveassistance at decision points along a route. Thus, a user of thesenavigational aids may frequently find themselves missing decision pointsaltogether, or not being in a correct position to navigate a coursethrough an upcoming decision point. As such a user who is unsure aboutan upcoming decision may have to halt their travel to decipher theambiguity. Clearly, in many cases halting travel is not a viablealternative. For example, when the user is traveling on an interstate itis entirely impossible to simply stop. The alternative of pulling off onthe shoulder is undesirable and can be dangerous. Pulling off on an exitis equally undesirable since doing so increases travel time and providesan added inconvenience to the user. In other instances, such asnavigating downtown city streets, the traffic issues alone may preventthe user from stopping their vehicle during the recalculation process.Even if the user has the ability to safely stop their vehicle, such aswhen traveling in a neighborhood, the inconvenience factor is present.Moreover, when the user entirely misses the decision point the headacheand frustration of navigating their route is compounded, leaving theuser to further resolve how to back track and again attempt to negotiatethe missed decision point.

Current prior art systems have created a spectrum of products in whichthe degree of navigational accuracy is dictated primarily by the cost ofthe system. The lower cost systems currently offer a low degree ofaccuracy that is often inadequate for users. Therefore, there exists aneed for a navigational route planning device which is more efficientand accurate than current low cost systems, without requiring moreexpensive system resources. In addition, there is also a need for anavigational route planning device which provides more understandable,accurate and timely assistance for negotiating decision points along aroute.

SUMMARY OF THE INVENTION

The above mentioned problems of navigational devices are addressed bythe present invention and will be understood by reading and studying thefollowing specification. Systems and methods are provided for anavigational route planning device which is more efficient and accuratethan current low cost systems, without requiring the more expensivesystem resources. The systems and methods of the present invention offeran improved navigational route planning device which provides moreunderstandable, accurate and timely assistance for negotiating decisionpoints along a route.

In one embodiment of the present invention, an electronic navigationalaid device with a next turn page is provided. The navigational aiddevice includes a processor adapted to communicate with a memory. Thememory has cartographic data and a route to a desired destination storedtherein. The cartographic data includes data indicative of thoroughfaresof a plurality of types. A display is provided which is adapted tocommunicate with the processor and the memory and which is capable ofdisplaying the cartographic data. The device processes travel along theroute. The device recognizes when the device is approaching a decisionpoint in the route and provides to the display an overlay screen on topof any presently displayed screen, the overlay screen adapted to displaya preview of a decision point with accurate geographic detail and othercues.

These and other embodiments, aspects, advantages, and features of thepresent invention will be set forth in part in the description whichfollows, and in part will become apparent to those skilled in the art byreference to the following description of the invention and referenceddrawings or by practice of the invention. The aspects, advantages, andfeatures of the invention are realized and attained by means of theinstrumentalities, procedures, and combinations particularly pointed outin the appended claims.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a representative view of a Global Positioning System (GPS);

FIGS. 2A and 2B illustrate views for one embodiment of an electronicnavigational device according to the teachings of the present invention;

FIGS. 3A-3C illustrate views for another embodiment of an electronicnavigational device according to the teachings of the present invention;

FIG. 4A is a block diagram of one embodiment for the electroniccomponents within the hardware of FIGS. 2A-2B according to the teachingsof the present invention;

FIG. 4B is a block diagram of one embodiment for the electroniccomponents within the hardware of FIGS. 3A-3C according to the teachingsof the present invention;

FIG. 5 is a block diagram of a navigation system according to theteachings of the present invention;

FIG. 6 is a flow diagram of one embodiment of a navigation aid methodaccording to the teachings of the present invention;

FIG. 7 is a flow diagram of another embodiment of a navigation aidmethod according to the teachings of the present invention; and

FIG. 8 is a diagram illustrating an overlay screen, on a display ofcartographic data, providing a select set of geographic detail fornegotiating a course through a decision point in a route according toone embodiment of the present invention.

DETAILED DESCRIPTION OF THE INVENTION

In the following detailed description of the invention, reference ismade to the accompanying drawings which form a part hereof, and in whichis shown, by way of illustration, specific embodiments in which theinvention may be practiced. The embodiments are intended to describeaspects of the invention in sufficient detail to enable those skilled inthe art to practice the invention. Other embodiments may be utilized andchanges may be made without departing from the scope of the presentinvention. The following detailed description is, therefore, not to betaken in a limiting sense, and the scope of the present invention isdefined only by the appended claims, along with the full scope ofequivalents to which such claims are entitled.

The present invention is drawn to navigational systems and deviceshaving automated next turn page capabilities. One type of navigationalsystem includes Global Positioning Systems (GPS). Such systems are knownand have a variety of uses. In general, GPS is a satellite-based radionavigation system capable of determining continuous position, velocity,time, and in some instances direction information for an unlimitednumber of users. Formally known as NAVSTAR, the GPS incorporates aplurality of satellites which orbit the earth in extremely preciseorbits. Based on these precise orbits, GPS satellites can relay theirlocation to any number of receiving units.

The GPS system is implemented when a device specially equipped toreceive GPS data begins scanning radio frequencies for GPS satellitesignals. Upon receiving a radio signal from a GPS satellite, the devicecan determine the precise location of that satellite via one ofdifferent conventional methods. The device will continue scanning forsignals until it has acquired at least three different satellitesignals. Implementing geometric triangulation, the receiver utilizes thethree known positions to determine its own two-dimensional positionrelative to the satellites. Additionally, acquiring a fourth satellitesignal will allow the receiving device to calculate itsthree-dimensional position by the same geometrical calculation. Thepositioning and velocity data can be updated in real time on acontinuous basis by an unlimited number of users.

FIG. 1 is representative of a GPS denoted generally by reference numeral100. A plurality of satellites 120 are in orbit about the Earth 124. Theorbit of each satellite 120 is not necessarily synchronous with theorbits of other satellites 120 and, in fact, is likely asynchronous. AGPS receiver device 140 of the present invention is shown receivingspread spectrum GPS satellite signals 160 from the various satellites120.

The spread spectrum signals 160 continuously transmitted from eachsatellite 120 utilize a highly accurate frequency standard accomplishedwith an extremely accurate atomic clock. Each satellite 120, as part ofits data signal transmission 160, transmits a data stream indicative ofthat particular satellite 120. It will be appreciated by those skilledin the relevant art that the GPS receiver device 140 must acquire spreadspectrum GPS satellite signals 160 from at least three satellites 120for the GPS receiver device 140 to calculate its two-dimensionalposition by triangulation. Acquisition of an additional signal 160,resulting in signals 160 from a total of four satellites 120, permitsGPS receiver device 140 to calculate its three-dimensional position.

FIGS. 2A and 2B illustrate views for one embodiment of an electronicnavigational device 230 according to the teachings of the presentinvention. As one of ordinary skill in the art will understand uponreading this disclosure, the device can be portable and can be utilizedin any number of implementations such as automobile, personal marinecraft, and avionic navigation. In the embodiment of FIG. 2A a front viewof the navigational device 230 is provided showing the navigationaldevice has a generally rectangular housing 232. The housing 232 isconstructed of resilient material and has been rounded for aesthetic andergonomic purposes. As shown in FIG. 2A, the control face 234 has accessslots for an input key pad 238, other individual keys 239, and a displayscreen 236. In one embodiment, the display screen 236 is a LCD displaywhich is capable of displaying both text and graphical information. Theinvention, however, is not so limited. Audio information can likewise beprovided in one embodiment.

In FIG. 2B, a side view of the navigational device 230 is provided. FIG.2B illustrates that the device's housing 232 is defined by an outerfront case 240 and a rear case 242. As shown in FIG. 2B, the outer frontcase 240 is defined by the control face 234. In the embodiment shown inFIG. 2B, the outer front case 240 and the rear case 242 are made of onemolded piece to form the device housing 232 and support input key pad238, other individual keys 239, and display screen 236 in respectiveaccess slots shown in the control face 234 of FIG. 2A.

FIGS. 3A-3C illustrate views for another embodiment of an electronicnavigational device 310 according to the teachings of the presentinvention. The navigational device 310 shown in FIGS. 3A-3C includes apersonal digital assistant (PDA) with integrated GPS receiver andcellular transceiver according to the teachings of the presentinvention. The GPS integrated PDA operates with an operating system (OS)such as, for example, the well-known Palm or Pocket PC operatingsystems, or the lesser-used Linux OS. As shown in the top view of FIG.3A, the GPS integrated PDA 310 includes an internal integrated GPS patchantenna 314 and a cellular transceiver 316 contained in a housing 318.The housing 318 is generally rectangular with a low profile and has afront face 320 extending from a top end 322 to a bottom end 324. Mountedon front face 320 is a display screen 326, which is touch sensitive andresponsive to a stylus 330 (shown stored in the side view of FIG. 3B) ora finger touch. FIGS. 3A-3C illustrate the stylus 330 nested withinhousing 318 for storage and convenient access in a conventional manner.The embodiment shown in FIG. 3A illustrates a number of control buttons,or input keys 328 positioned toward the bottom end 324. The invention,however, is not so limited and one of ordinary skill in the art willappreciate that the input keys 328 can be positioned toward the top end322 or at any other suitable location. The end view of FIG. 3Cillustrates a map data cartridge bay slot 332 and headphone jack 334provided at the top end 322 of the housing 318. Again, the invention isnot so limited and one of ordinary skill in the art will appreciate thata map data cartridge bay slot 332 and headphone jack 334 can be providedat the bottom end 324, separately at opposite ends, or at any othersuitable location.

It should be understood that the structure of GPS integrated PDA 310 isshown as illustrative of one type of integrated PDA navigation device.Other physical structures, such as a cellular telephone and avehicle-mounted unit are contemplated within the scope of thisinvention.

FIGS. 2A-2B and 3A-3C are provided as illustrative examples of hardwarecomponents for a navigational device according to the teachings of thepresent invention. However, the invention is not limited to theconfiguration shown in FIGS. 2A-2B and 3A-3C. One of ordinary skill inthe art will appreciate other suitable designs for a hardware devicewhich can accommodate the present invention.

FIG. 4A is a block diagram of one embodiment for the electroniccomponents within the hardware of FIGS. 2A-2B, such as within housing232 and utilized by the electronic navigational device. In theembodiment shown in FIG. 4A, the electronic components include aprocessor 410 which is connected to an input 420, such as keypad vialine 425. It will be understood that input 420 may alternatively be amicrophone for receiving voice commands. Processor 410 communicates withmemory 430 via line 435. Processor 410 also communicates with displayscreen 440 via line 445. An antenna/receiver 450, such as a GPSantenna/receiver is connected to processor 410 via line 455. It will beunderstood that the antenna and receiver, designated by referencenumeral 450, are combined schematically for illustration, but that theantenna and receiver may be separately located components, and that theantenna may be a GPS patch antenna or a helical antenna. The electroniccomponents further include I/O ports 470 connected to processor 410 vialine 475.

FIG. 4B is a block diagram of one embodiment for the electroniccomponents within the hardware of FIGS. 3A-3C and utilized by the GPSintegrated PDA 310 according to the teachings of the present invention.The electronic components shown in FIG. 4B include a processor 436 whichis connected to the GPS antenna 414 through GPS receiver 438 via line441. The processor 436 interacts with an operating system (such asPalmOS; Pocket PC) that runs selected software depending on the intendeduse of the PDA 310. Processor 436 is coupled with memory 442 such as RAMvia line 444, and power source 446 for powering the electroniccomponents of PDA 310. The processor 436 communicates with touchsensitive display screen 426 via data line 448.

The electronic components further include two other input sources thatare connected to the processor 436. Control buttons 428 are connected toprocessor 436 via line 451 and a map data cartridge 433 inserted intocartridge bay 432 is connected via line 452. A conventional serial I/Oport 454 is connected to the processor 436 via line 456. Cellularantenna 416 is connected to cellular transceiver 458, which is connectedto the processor 436 via line 466. Processor 436 is connected to thespeaker/headphone jack 434 via line 462. The PDA 310 may also include aninfrared port (not shown) coupled to the processor 436 that may be usedto beam information from one PDA to another.

As will be understood by one of ordinary skill in the art, theelectronic components shown in FIGS. 4A and 4B are powered by a powersource in a conventional manner. As will be understood by one ofordinary skill in the art, different configurations of the componentsshown in FIGS. 4A and 4B are considered within the scope of the presentinvention. For example, in one embodiment, the components shown in FIGS.4A and 4B are in communication with one another via wireless connectionsand the like. Thus, the scope of the navigation device of the presentinvention includes a portable electronic navigational aid device.

Using the processing algorithms of the present invention, the deviceprocesses travel along the route. Using the processing algorithms andthe cartographic data and planned route stored in memory, the devicerecognizes when the device is approaching a decision point in the routeand provides to the display an overlay screen on top of any presentlydisplayed screen. The overlay screen is adapted to display a preview ofa decision point with accurate geographic detail and other cues.According to the teachings of the present invention, the deviceincorporates these and other functions as will be explained in moredetail below in connection with FIGS. 6-8.

FIG. 5 is a block diagram of an embodiment of a navigation system whichcan be adapted to the teachings of the present invention. The navigationsystem includes a server 502. According to one embodiment, the server502 includes a processor 504 operably coupled to memory 506, and furtherincludes a transmitter 508 and a receiver 510 to send and receive data,communication, and/or other propagated signals. The transmitter 508 andreceiver 510 are selected or designed according to the communicationrequirements and the communication technology used in the communicationdesign for the navigation system. The functions of the transmitter 508and the receiver 510 may be combined into a single transceiver.

The navigation system further includes a mass data storage 512 coupledto the server 502 via communication link 514. The mass data storage 512contains a store of navigation data. One of ordinary skill in the artwill understand, upon reading and comprehending this disclosure, thatthe mass data storage 512 can be separate device from the server 502 orcan be incorporated into the server 502.

In one embodiment of the present invention, the navigation systemfurther includes a navigation device 516 adapted to communicate with theserver 502 through the communication channel 518. According to oneembodiment, the navigation device 516 includes a processor and memory,as previously shown and described with respect to the block diagram ofFIG. 4. Furthermore, the navigation device 516 includes a transmitter520 and receiver 522 to send and receive communication signals throughthe communication channel 518. The transmitter 520 and receiver 522 areselected or designed according to the communication requirements and thecommunication technology used in the communication design for thenavigation system. The functions of the transmitter 520 and receiver 522may be combined into a single transceiver.

Software stored in the server memory 506 provides instructions for theprocessor 504 and allows the server 502 to provide services to thenavigation device 516. One service provided by the server 502 involvesprocessing requests from the navigation device 516 and transmittingnavigation data from the mass data storage 512 to the navigation device516. According to one embodiment, another service provided by the server502 includes processing the navigation data using various algorithms fora desired application, and sending the results of these calculations tothe navigation device 516.

The communication channel 518 is the propagating medium or path thatconnects the navigation device 516 and the server 502. According to oneembodiment, both the server 502 and the navigation device 516 include atransmitter for transmitting data through the communication channel anda receiver for receiving data that has been transmitted through thecommunication channel.

The communication channel 518 is not limited to a particularcommunication technology. Additionally, the communication channel 518 isnot limited to a single communication technology; that is, the channel518 may include several communication links that use a variety oftechnology. For example, according to various embodiments, thecommunication channel is adapted to provide a path for electrical,optical, and/or electromagnetic communications. As such, thecommunication channel includes, but is not limited to, one or acombination of the following: electrical circuits, electrical conductorssuch as wires and coaxial cables, fiber optic cables, converters,radio-frequency (RF) waveguides, the atmosphere, and empty space.Furthermore, according to various embodiments, the communication channelincludes intermediate devices such as routers, repeaters, buffers,transmitters, and receivers, for example.

In one embodiment, for example, the communication channel 518 includestelephone and computer networks. Furthermore, in various embodiments,the communication channel 516 is capable of accommodating wirelesscommunication such as radio frequency, microwave frequency and infraredcommunication, and the like. Additionally, according to variousembodiments, the communication channel 516 accommodates satellitecommunication.

The communication signals transmitted through the communication channel518 include such signals as may be required or desired for a givencommunication technology. For example, the signals may be adapted to beused in cellular communication technology, such as time divisionmultiple access (TDMA), frequency division multiple access (FDMA), codedivision multiple access (CDMA), global system for mobile communications(GSM), and the like. Both digital and analog signals may be transmittedthrough the communication channel 518. According to various embodiments,these signals are modulated, encrypted and/or compressed signals as maybe desirable for the communication technology.

The mass data storage includes sufficient memory for the desirednavigation application. Examples of mass data storage include magneticdata storage media such as hard drives, optical data storage media suchas CD ROMs, charge storing data storage media such as Flash memory, andmolecular memory, such as now known or hereinafter developed.

According to one embodiment of the navigation system, the 502 serverincludes a remote server accessed by the navigation device 516 through awireless channel. According to other embodiments of the navigationsystem, the server 502 includes a network server located on a local areanetwork (LAN), wide area network (WAN), a virtual private network (VPN)and server farms.

According to another embodiment of the navigation system, the server 502includes a personal computer such as a desktop or laptop computer. Inone embodiment, the communication channel 518 is a cable connectedbetween the personal computer and the navigation device. According toone embodiment, the communication channel 518 is a wireless connectionbetween the personal computer and the navigation device 516.

FIG. 5 presents yet another embodiment for a collective set ofelectronic components adapted to the present invention. As one ofordinary skill in the art will understand upon reading and comprehendingthis disclosure, the navigation system of FIG. 5 is adapted to thepresent invention in a manner distinguishable from that described andexplained in detail in connection with FIG. 4.

That is, the navigational system 500 of FIG. 5 is likewise adapted toprovide an electronic navigational aid device 516 with instructionalaids to assist in negotiating a course through a decision point in aroute. In this embodiment, the processor 504 in the server 502 is usedto handle the bulk of the system's processing needs. The mass storagedevice 512 connected to the server can include volumes more cartographicand route data than that which is able to be maintained on thenavigational device 516 itself. In this embodiment, the server 502processes the majority of a device's travel along the route using a setof processing algorithms and the cartographic and route data stored inmemory 512 and can operate on signals, e.g. GPS signals, originallyreceived by the navigational device 516. Similar to the navigationaldevice of FIG. 4, the navigation device 516 in system 500 is outfittedwith a display 524 and GPS capabilities 526.

As described and explained in detail in connection with FIG. 4, thenavigation system of FIG. 5 uses processing algorithms to process travelalong a route. The processor 504 operates on algorithms and thecartographic data and planned route stored in memory 506. Using thenovel processing algorithms and the cartographic data and planned routestored in memory 506, the device recognizes when the device isapproaching a decision point in the route and creates an overlay screenwhich can be provided to the display on top of any presently displayedscreen. The overlay screen created by the servers is adapted to displaya preview of a decision point with accurate geographic detail and othercues. According to the teachings of the present invention, the deviceincorporates these and other functions as will be explained in moredetail below in connection with FIGS. 6-8. As one of ordinary skill inthe art will understand upon reading and comprehending this disclosure,a user of the navigation device 516 can be proximate to or accompanyingthe navigation device 516. The invention however, is not so limited. Thenavigation device 516 of the present invention includes a portableelectronic navigational aid device.

The features and functionality explained and described in detail abovein connection with the device of FIG. 4 are likewise available in thesystem 500 of FIG. 5. That is, as will be explained in more detailbelow, in one embodiment the navigation device 516 further providesaudio and visual cues to aid the navigation along the route.

FIG. 6 is a flow diagram of one embodiment of a navigation aid methodaccording to the teachings of the present invention. The navigation aidmethod includes a method for providing an overlay screen on top of anypresently displayed screen, the overlay screen adapted to display apreview of a decision point with accurate geographic detail and othercues within a navigation device or navigation system as described andexplained in detail above in connection with FIGS. 4 and 5. And, asdescribed above, a processor is used for processing signals whichinclude input data from input devices, e.g. keypads or other input keys,GPS signals from GPS components, and data received from I/O ports inorder to perform the methods described herein. As shown in FIG. 6, thenavigation aid method for providing a preview of a decision point withaccurate geographic detail includes detecting when a navigation deviceis approaching a decision point in a route as shown in block 610. Themethod includes calculating the device's current travel speed andposition at block 620. In one embodiment, calculating the device'scurrent travel speed and position includes using a global positioningsystem. At block 630, the method further includes providing to a displayan overlay screen on top of any presently displayed screen, the overlayscreen adapted to display a preview of a decision point. According tothe teachings of the present invention, providing the overlay screenincludes providing in the overlay screen cartographic data accuratelydepicting a geographic detail of the decision point. In one embodimentof the invention, the display continuously displays the device'sposition and uses audio instructions to navigate along the route as wellas through a course at the decision point.

In one embodiment, providing the geographic-detail includes providingthe geographic detail in a dynamic magnified display scale, incomparison to a display scale of the presently displayed screen, basedon a road classification for a thoroughfare on which the device iscurrently traveling. In one embodiment, providing the geographic detailincludes providing the geographic detail with a highlighted portionindicating a course to follow through the decision point. In oneembodiment, providing the geographic detail includes providing a markercentered at the decision point.

As one of ordinary skill in the art will understand upon reading andcomprehending this disclosure, any one or more of the above features canbe combined into a particular embodiment of the invention. Likewise, inthe invention any one or a combination of the above functions can beoptionally de-activated in the device. One of ordinary skill in the artwill further understand that the method includes a using a computeraccessible medium having a set of computer executable instructionsoperable to perform the method.

In one method embodiment of the present invention, the device operateson data indicative of a set of travel habits of the device on each ofthe plurality of types of thoroughfares and stores the travel habit datain the memory. In one embodiment of the present invention, the travelhabit data includes data relating to the thoroughfare classification,the speed classification of the thoroughfare, the time of day, and thehistorical travel speed of the device on the particular thoroughfare. Inthe invention, the device calculates the device's current position atregular intervals. That is, the device calculates the device's currentposition continuously. The display provides continuously displays adevice's position and uses audio instructions to navigate to the routeas well as to navigate a course through a decision point along theroute. Again, in one embodiment, the device can continuously provide thedevice's current travel speed and location using a global positioningsystem.

The device of the present invention includes a portable electronicnavigational aid device. In one embodiment, the portable electronicnavigation aid device includes a portable vehicle, or automobilenavigation device, a navigational device for marine craft, aircraft,portable handheld units, and others of the like.

FIG. 7 is a flow diagram of another embodiment of a navigation aidmethod according to the teachings of the present invention. Thenavigation aid method includes a presently displayed, default, orregularly displayed screen displaying cartographic data and a route tonavigate from a beginning position to a desired destination, thecartographic data including data indicative of thoroughfares of aplurality of types, the route including a number of decision points. Inthe invention, this screen can be referred to as the map screen ornavigation screen. However, the invention is not limited to the same andany number of additional navigational aid screens can be provided on thedisplay screen as the same will be understood by one of ordinary skillin the art upon reading and comprehending this disclosure. In themethod, the display is in communication with a processor and memory andis operable for displaying the cartographic data, the route to thedesired destination, and the device's position on the presentlydisplayed screen.

The navigation aid method includes a method for providing an overlayscreen on top of any presently displayed screen. In the method, theoverlay screen is adapted to display a preview of a decision point withaccurate geographic detail and other cues within a navigation device asdescribed and explained in detail above in connection with FIGS. 4 and5. And, as described above, a processor is used for processing signalswhich include input data from user input devices, e.g. keypads or otherinput keys, GPS signals from GPS device/system components, and datareceived from I/O ports in order to perform the methods describedherein.

In FIG. 7, the navigation aid method for providing a preview of adecision point with accurate geographic detail includes using aprocessor in communication with a memory to operate on one or more routeprocessing algorithms. A display is provided, as described in detailabove, in communication with the processor and capable of displaying thecartographic data, the route to the desired destination, and thedevice's position. As described above, the device processes travel alongthe route and provides location data to the display. In the method, thedevice recognizes when the device is approaching a decision point in theroute and provides to the display an overlay screen on top of anypresently displayed screen. This is sometimes termed as a screen inscreen, or picture in picture display. As shown in block 710, the methodincludes calculating a current position and travel speed of the device.The method includes determining whether the device is approaching adecision point at block 720. In the present invention, determiningwhether the device is approaching a decision point includes determiningif a set of criteria have been met for timing when a preview of thedecision point will be provided in an overlay screen. According to theteachings of the present invention, the set of criteria include, but arenot limited to, how proximate the device is to the decision point andhow quickly the device is approaching the decision point, e.g. how fastthe device is traveling. For example, in one embodiment of theinvention, the device provides a preview of the decision point at somepredetermined time window before the device reaches the decision point,e.g. 30-90 seconds before the device reaches the decision point. In theinvention, the device determines this time window based on a set ofcriteria such as a classification of the thoroughfare on which thedevice is traveling, a speed classification of the thoroughfare on whichthe device is traveling, and a current travel speed of the device.

To further explain, in one embodiment, the device analyzes or assessesthe speed classification of the thoroughfare on which the device istraveling and a current travel speed of the device to determine thepoint in time in advance of the decision point to display the overlayscreen previewing the decision point. Thus, for example, if the deviceis traveling on a major interstate at a high rate of speed, then thedevice will provide the overlay screen previewing the next decisionpoint at a time approximated to be about 90 seconds in advance ofreaching the decision point in order to provide enough advance warningfor the device to position itself correctly to be able to negotiate acourse through the decision point when it arrives. Alternatively, if thedevice is traveling on a minor thoroughfare at a low rate of speed, thenthe device will provide the overlay screen previewing the next decisionpoint at a time approximately 30 seconds in advance of reaching thedecision point, again in order to provide enough advance warning for thedevice to position itself correctly to be able to negotiate a coursethrough the decision point yet still be proximate enough in time to thedecision point to provide the most effective navigation assistance.Additional navigation assistance can be provided as described inco-pending, commonly assigned U.S. patent application, entitled“Navigation System, Method and Device with Voice Guidance,” Ser. No.10/029,732, which is filed on even date herewith and which disclosure isherein incorporated by reference.

If the device is not approaching a decision point, the method proceedsto block 730 and continues to navigate the route. As shown in FIG. 7,the method includes returning to block 710 to regularly calculate acurrent position and travel speed of the device and further returning toblock 720 to repeatedly assess if the device is approaching a decisionpoint in the route.

If the device is approaching a decision point, the method determines ifthe device is at or upon the decision point at block 740 as describedabove. In one embodiment, if the device is approaching a decision pointthe device provides a tone to provide a warning or indication of thesame. As one of ordinary skill in the art will understand upon readingthis disclosure, the tone can be adapted to suit the needs of aparticular device implementation. That is, in some implementations thetone is desirable in order to increase the navigational assistance ofthe device and alert a user in a manner which minimizes a user'sinteraction or focus on the device. In an alternative embodiment, asdescribed in more detail in copending, commonly assigned applicationSer. No. 10/029,732, entitled “Navigation System, Method and Device withVoice Guidance,” the device communicates audio instructions to a user toincrease the navigational assistance and minimize a user's interactionor focus on the device.

If the device is not yet at the decision point, but is proximate enoughto trigger the overlay screen providing a preview of the decision point,then the method proceeds to block 750. In block 750, the device providesa preview of a course through the next decision point as a dynamicoverlay screen, picture in picture screen, pop-up screen or the like,over any presently displayed screen. In the invention, the dynamicoverlay screen includes the dynamic functionality described in moredetail below.

According to the teachings of the present invention, when the overlayscreen is provided in advance of next decision point, the overlay screencan provide geographic detail of a course through the decision pointeven though that cartographic detail is not shown on the presentlydisplayed underlying screen. As will be understood by one of ordinaryskill in the art upon reading and understanding this disclosure, themethod of the invention further facilitates an advance preview of anynumber of decision points along a route which can be called up as anoverlay screen, as described herein, in any order or at any time basedon the device receiving an appropriate call up input signal.

In block 760, the method includes timing out the display of the overlayscreen to return the full display to the underlying display screen. Inone embodiment, by way of example and not by way of limitation, thedevice times out the display of the overlay screen after 10 seconds. Asone of ordinary skill in the art will understand upon reading andcomprehending this disclosure the time-out functionality can be adjustedto suit a particular device implementation and the overlay screen canfurther be removed more quickly upon receiving a remove input signal.Upon time-out, the device returns the display to a full screen displayof the underlying screen, which can be the map screen or any othernavigation aid screen, as the same will be known and understood by oneof ordinary skill in the art, and continues navigating the route inblock 770. Thus, in one embodiment, the display screen is returned inblock 770 to the map screen and once again displays the actual locationof the device on a cartographic display of the route.

According to the teachings of the present invention, the method willreturn to block 740 to analyze, assess or determine if the device hasreached the decision point. When the answer is yes, e.g. the device hasreached the decision point, then the method proceeds to block 780 andprovides a dynamic overlay screen having a course through the decisionpoint. In one embodiment of this overlay screen, the overlay screenincludes a static display of the geographic detail of the course throughthe decision point and dynamically displays the device's movement as thedevice negotiates through the decision point. The same is shown in moredetail in FIG. 8. In this embodiment, the decision point is centered inthe overlay screen. In this embodiment, resources of the device can beconserved since the device does not have to continually processredrawing the geographic detail in the overlay map as a track-uporientation, as the same will be understood by one of ordinary skill inthe art, during negotiation of the device through the course at thedecision point. In an alternative embodiment, according to the teachingsof the present invention, the overlay screen includes a dynamic movingmap display of the geographic detail of the course through the decisionpoint having the location or position of the device centered in theoverlay screen. The invention is not so limited.

Next, in block 785 the method determines, analyzes, or assesses whetherthe device has completed the course through the decision point. If thedevice has not completed the course through the decision point theoverlay screen remains displayed as shown in block 787. That is, in theinvention, the overlay screen having geographic detail of a coursethrough the decision point is provided to the display until the devicehas successfully negotiated the course through the decision point. Once,the device has successfully navigated through the decision point, themethod proceeds to block 790 and removes the overlay screen to returnthe full display to the underlying display. At block 795, the devicecontinues to navigate the route, proceeding through the sequencedescribed above, e.g. returning to block 710 to continuously calculate acurrent position and travel speed of the device.

As one of ordinary skill in the art will understand upon reading andcomprehending this disclosure, the overlay screen displays actual, trueto life, cartographic data to represent a course of action to followthrough a decision point. That is, the overlay screen accuratelydisplays cartographic data representing the true layout of the route,e.g. the shape and topography of a roadway network. This is in contrastto an overlay screen which simply provides a precanned bitmap image ofinstructional symbols. As one of ordinary skill in the art willunderstand upon reading and comprehending this disclosure, suchprecanned, bitmap instructional symbols often provide poor correlationto the true course of action necessary in the real life decision pointalong a route and can provide frustration and confusion to a user of thedevice when faced with multiple courses of action in a network ofthoroughfares which could equally correspond to the precanned symbol.

FIG. 8 is a diagram illustrating an overlay screen 810, on a display ofcartographic data 820, providing a select set of geographic detail fornegotiating a course 830 through a decision point in a route accordingto one embodiment of the present invention. In the embodiment shown inFIG. 8, the full display screen 820 includes a presently displayed,default, or regularly displayed screen displaying cartographic data anda route to navigate from a beginning position to a desired destination,the route including a number of decision points. In the invention, thisscreen can be referred to as the map screen or navigation screen 820.However, the invention is not limited to the same and any number ofadditional navigational aid screens can be provided on the displayscreen as the same will be understood by one of ordinary skill in theart upon reading and comprehending this disclosure. In the embodimentshown in FIG. 8, the cartographic data including data indicative ofthoroughfares of a plurality of types 825.

As shown in FIG. 8, the geographic detail in the overlay screen 810 fornegotiating a course includes a geographic detail provided on amagnified display scale in comparison to a display scale of thepresently displayed screen, or underlying screen 820. In one embodiment,according to the teachings of the present invention, the magnifieddisplay scale is a dynamic display scale based on a road classificationfor a thoroughfare on which the device is currently traveling. As willbe understood by one of ordinary skill in the art upon reading andcomprehending this disclosure, in one embodiment the geographic detailin the overlay screen 810 includes geographic detail not shown on thepresently displayed screen 820, such as when the overlay screen 810 isproviding an advance preview of an upcoming decision point.

According to the teachings of the present invention, the device alwaysdynamically provides the overlay screen 810 to the display when thedevice is at the decision point. As described above, in one embodiment,the geographic data in the overlay screen 810 is static with thedecision point centered in the overlay screen and the device dynamicallydisplays a movement of the device, shown at 840 on the course 830through the decision point. As described above, the device can providethe overlay screen 810 to the displayed for a fixed amount of time assuited to a particular device implementation. As described above, thedevice is operable to provide in an overlay screen 810, the geographicdetail of any decision point along the route upon receiving a previewrequest signal regardless of a content of the presently displayedscreen.

In the invention, the device is adapted to remove insignificant detailfrom the geographic detail at the decision point based on a set ofcriteria. In one embodiment, the set of criteria includes any one or anycombination of the following; whether a cartographic detail is athoroughfare, and whether a nearby thoroughfare in the cartographic dataintersects with a thoroughfare on which the device is currentlytraveling. However, the invention is not so limited. That is in oneembodiment, the device removes all geographic detail such as ponds,lakes, and other geographic detail of the like which are notthoroughfares. In one embodiment, the device further removes allthoroughfares from the geographic detail which are thoroughfares that donot intersect the thoroughfare on which the device is currentlytraveling. That is the thoroughfare does not intersect at a node suchthat the device can turn onto that adjacent thoroughfare. In anotherembodiment, the device removes adjacent thoroughfares from thegeographic detail, but leaves thoroughfares in the geographic detailwhich intersect the thoroughfare on which the device is actuallytraveling whether or not the device can actually turn onto theintersecting thoroughfare. That is, the device includes thoroughfares inthe geographic detail which intersect the thoroughfare on which thedevice currently traveling such as a thoroughfare which intersects as anunderpass or overpass in a Z plane, as the same will be know anunderstood by one of ordinary skill in the art.

In one embodiment, the device removes, from the geographic detail,thoroughfares based on a set of adjacency criteria which includes, butis not limited to, a thoroughfares name, thoroughfare classification,speed classification of the thoroughfares, non-significant terraindetail, and other criteria of the like. As used herein, the termadjacency information, or adjacencies, is intended to include anythoroughfare which intersects the current thoroughfare on which thedevice is traveling. Every place two roads intersect is termed a node.Thus, every node on a given thoroughfare connects that thoroughfare toan adjacency, or adjacent thoroughfare.

In some embodiments, the methods provided above are implemented as acomputer data signal embodied in a carrier wave or propagated signal,that represents a sequence of instructions which, when executed by aprocessor, such as processor 410 in FIG. 4 or processor 504 in FIG. 5,cause the processor to perform the respective method. In otherembodiments, methods provided above are implemented as a set ofinstructions contained on a computer-accessible medium, such as memory430 in FIG. 4 or mass storage device 512 in FIG. 5, capable of directinga processor, such as processor 410 in FIG. 4 or processor 504 in FIG. 5,to perform the respective method. In varying embodiments, the medium isa magnetic medium, an electronic medium, or an optical medium.

As one of ordinary skill in the art will understand upon reading thisdisclosure, the electronic components of device 400 shown in FIG. 4 andcomponents of the system 500 shown in FIG. 5 can be embodied as computerhardware circuitry or as a computer-readable program, or a combinationof both. In another embodiment, system 500 is implemented in anapplication service provider (ASP) system.

The system of the present invention includes software operative on aprocessor to perform methods according to the teachings of the presentinvention. One of ordinary skill in the art will understand, uponreading and comprehending this disclosure, the manner in which asoftware program can be launched from a computer readable medium in acomputer based system to execute the functions defined in the softwareprogram. One of ordinary skill in the art will further understand thevarious programming languages which may be employed to create a softwareprogram designed to implement and perform the methods of the presentinvention. The programs can be structured in an object-orientation usingan object-oriented language such as Java, Smalltalk or C++, and theprograms can be structured in a procedural-orientation using aprocedural language such as COBOL or C. The software componentscommunicate in any of a number of means that are well-known to thoseskilled in the art, such as application program interfaces (A.P.I.) orinterprocess communication techniques such as remote procedure call(R.P.C.), common object request broker architecture (CORBA), ComponentObject Model (COM), Distributed Component Object Model (DCOM),Distributed System Object Model (DSOM) and Remote Method Invocation(RMI). However, as will be appreciated by one of ordinary skill in theart upon reading this disclosure, the teachings of the present inventionare not limited to a particular programming language or environment.

CONCLUSION

The above systems, devices and methods have been described, by way ofexample and not by way of limitation, with respect to improvingaccuracy, processor speed and ease of user interaction with a navigationdevice. That is, the systems, devices and methods provide for anavigational route planning device which is more efficient and accuratethan current low cost systems, without requiring the more expensivesystem resources. The systems, devices and methods of the presentinvention offer an improved navigational route planning device whichprovide more understandable, accurate and timely assistance fornegotiating decision points along a route.

Although specific embodiments have been illustrated and describedherein, it will be appreciated by those of ordinary skill in the artthat any arrangement which is calculated to achieve the same purpose maybe substituted for the specific embodiment shown. This application isintended to cover any adaptations or variations of the presentinvention. It is to be understood that the above description is intendedto be illustrative, and not restrictive. Combinations of the aboveembodiments, and other embodiments will be apparent to those of skill inthe art upon reviewing the above description. The scope of the inventionincludes any other applications in which the above systems, devices andmethods are used. The scope of the invention should be determined withreference to the appended claims, along with the full scope ofequivalents to which such claims are entitled.

1. An electronic navigational aid device with an automatic next turnpage, comprising: a processor; a memory adapted to communicate to theprocessor, the memory having cartographic data and a route to a desireddestination stored therein, the cartographic data including dataindicative of thoroughfares of a plurality of types; a display adaptedto communicate with the processor and the memory and capable ofdisplaying the cartographic data; wherein the device processes travelalong the route; wherein the device recognizes when the device isapproaching a decision point in the route and provides to the display anoverlay screen on top of any presently displayed screen, the overlayscreen adapted to display a preview of the decision point, including ahighlighted portion indicating a course to follow through the decisionpoint, and the overlay screen displays motion of the device on thecourse through the decision point; and wherein insignificant detail isremoved from the overlay screen at the decision point based on a set ofcriteria.
 2. The device of claim 1, wherein the overlay screen includescartographic data accurately depicting a geographic detail of thedecision point.
 3. The device of claim 2, wherein the geographic detailis provided on a magnified display scale in comparison to a displayscale of the presently displayed screen.
 4. The device of claim 3,wherein the magnified display scale is a dynamic display scale based ona road classification for a thoroughfare on which the device iscurrently traveling.
 5. The device of claim 2, wherein the geographicdetail includes the highlighted portion indicating the course to followthrough the decision point.
 6. The device of claim 2, wherein thegeographic detail includes a marker centered at the decision point. 7.The device of claim 2, wherein the device operates on data indicative ofa set of travel habits for the device on each of the plurality of typesof thoroughfares and stores the travel habits in the memory.
 8. Thedevice of claim 1, wherein the device regularly calculates the device'scurrent position.
 9. The device of claim 1, wherein the displaycontinuously displays the device's position and uses audio instructionsto navigate along the route as well as through a course at the decisionpoint.
 10. An electronic navigational aid device with an automatic nextturn page, comprising: a processor; a memory in communication with theprocessor, the memory having cartographic data and a route storedtherein to navigate from a beginning position to a desired destination,the cartographic data including data indicative of thoroughfares of aplurality of types, the route including a number of decision points; adisplay in communication with the processor and capable of displayingthe cartographic data, the route to the desired destination, and thedevice's position; wherein the device processes travel along the routeand provides location data to the display; wherein the device recognizeswhen the device is approaching a decision point in the mute and providesto the display an overlay screen on top of any presently displayedscreen, the overlay screen adapted to display a preview of the decisionpoint, the overlay screen including cartographic data accuratelydepicting a geographic detail of the decision point, the geographicdetail including a highlighted portion indicating a course to followthrough the decision point, and wherein the overlay screen displaysmotion of the device on the course through the decision point; whereinthe device is adapted to remove insignificant detail from the geographicdetail at the decision point based on a set of criteria.
 11. The deviceof claim 10, wherein the device dynamically provides the overlay screento the display in advance of the decision point based on a set ofcriteria.
 12. The device of claim 11, wherein the set of criteriaincludes any one or any combination of the following: a classificationof the thoroughfare on which the device is currently travelling; a speedclassification of the thoroughfare on which the device is currentlytravelling; and a speed at which the device is currently travelling. 13.The device of claim 10, wherein the geographic detail includesgeographic detail not shown on the presently displayed screen.
 14. Thedevice of claim 10, wherein the device dynamically provides the overlayscreen to the display when the device is at the decision point.
 15. Thedevice of claim 14, wherein the geographic data in the overlay screen isstatic with the decision point centered in the overlay screen and thedevice dynamically displays a movement of the device on a course throughthe decision point.
 16. The device of claim 10, wherein the deviceprovides the overlay screen to the display for a fixed amount of time.17. The device of claim 10, wherein the device is operable to provide inan overlay screen, the geographic detail of any decision point along theroute upon receiving a preview request signal regardless of a content ofthe presently displayed screen.
 18. The device of claim 10, wherein theset of criteria includes any one or any combination of the following:whether a cartographic detail is a thoroughfare; and whether a nearbythoroughfare in the cartographic data intersects with a thoroughfare onwhich the device is currently traveling.
 19. A navigation aid method fornegotiating decision points along a route, comprising: detecting when anavigation device is approaching a decision point in a mute; calculatingthe device's current travel speed and position; providing to a displayan overlay screen on top of any presently displayed screen, the overlayscreen adapted to display a preview of the decision point with ahighlighted portion indicating a course to follow through the decisionpoint; displaying motion of the device through the course on the overlayscreen; and wherein insignificant detail is removed from the overlayscreen at the decision point based on A set of criteria.
 20. The methodof claim 19, wherein providing the overlay screen includes providing inthe overlay screen cartographic data accurately depicting a geographicdetail of the decision point.
 21. The method claim 19, wherein providingthe geographic detail includes providing the geographic detail in adynamic magnified display scale in comparison to a display scale of thepresently displayed screen based on a road classification for athoroughfare on which the device is currently traveling.
 22. The methodof claim 19, wherein providing the geographic detail includes providingthe geographic detail with the highlighted portion indicating the courseto follow through the decision point.
 23. The method of claim 19,wherein the providing the geographic detail includes providing a markercentered at the decision point.
 24. The method of claim 19, whereincalculating the device's current travel speed and position includesusing a global positioning system.
 25. The method of claim 19, whereinthe display continuously displays the device's position and uses audioinstructions to navigate along the route as well as through a course atthe decision point.
 26. The method of claim 19, wherein the methodincludes using a computer accessible medium having a set of computerexecutable instructions operable to perform the method.
 27. A navigationsystem for negotiating a decision point along a route, comprising: aserver having a processor and memory, the memory having cartographicdata and a route stored therein to navigate from a beginning position toa desired destination, the cartographic data including data indicativeof thoroughfares of a plurality of types, the route including a numberof decision points; wherein the server includes executable instructionsstored thereon, the processor operable on the executable instructionsto: process travel of a navigation device along the route and providelocation data; recognize an approaching decision point in the route;trigger an overlay screen on the navigation device to display a previewof a decision point, the overlay screen including cartographic dataaccurately depicting a geographic detail of the decision point with ahighlighted portion indicating a course to follow through the decisionpoint, and the overlay screen displaying motion of the navigation deviceon the course through the decision point; and wherein insignificantdetail is removed from the geographic detail at the decision point basedon a set of criteria.
 28. The navigation system of claim 27, wherein thesystem further includes: a display in communication with the processorand capable of displaying the cartographic data, the route to thedesired destination, the device's position, and the overlay screen ontop of any presently displayed screen; and a navigation device adaptedto communicate with and retrieve navigation data from the server via acommunication channel, wherein the navigation device includes a displayadapted to display the overlay screen on top of any presently displayedscreen.
 29. The navigation system of claim 28, wherein the communicationchannel includes a wireless channel.
 30. The navigation system of claim28, wherein the system further includes a mass data storage adapted tostore navigation data.
 31. The navigation system of claim 28, whereinthe server includes processor adapted to respond to a request from thenavigation device by performing calculations on the navigation data andtransmitting results to the navigation device.
 32. The navigation systemof claim 28, wherein the navigation device adapted to communicate withand retrieve navigation data from the server using cellularcommunication technology.
 33. The navigation system of claim 27, whereinthe set of executable instructions further include instructions for:determining data indicative of a set of travel habits for a navigationdevice on each of the plurality of types of thoroughfares; and storingthe travel habit date in the memory.
 34. The navigation system of claim27, wherein the set of executable instructions further includeinstructions for regularly calculating a navigation device's currentposition.
 35. The navigation system of claim 27, wherein the set ofexecutable instructions further include instructions for dynamicallyproviding the overlay screen in advance of the decision point based on aset of criteria, wherein the set of criteria includes any one or anycombination of the following: a classification of the thoroughfare onwhich the device is currently traveling; a speed classification of thethoroughfare on which the device is currently traveling; and a speed atwhich the device is currently traveling.
 36. The navigation system ofclaim 35, wherein the geographic detail includes geographic detail notshown on the presently displayed screen.
 37. The navigation system ofclaim 27, wherein the set of executable instructions further includeinstructions for dynamically providing the overlay screen when anavigation device is at the decision point.
 38. The navigation system ofclaim 27, wherein the set of executable instructions further includeinstructions for: dynamically providing the overlay screen wherein thegeographic data in the overlay screen is static with the decision pointcentered in the overlay screen; and dynamically displaying in theoverlay screen a movement of a navigation device on a course through thedecision point.
 39. The navigation system of claim 27, wherein the setof executable instructions further include instructions for dynamicallyproviding the overlay screen for a fixed amount of time.
 40. Thenavigation system of claim 27, wherein the set of executableinstructions further include instructions for dynamically providing anoverlay screen containing geographic detail of any decision point alongthe route upon receiving a preview request signal.
 41. The navigationsystem of claim 27, wherein the set of executable instructions furtherinclude instructions for dynamically removing insignificant detail fromthe geographic detail at the decision point based on a set of criteria,wherein the set of criteria includes any one or any combination of thefollowing: whether a cartographic detail is a thoroughfare; and whethera nearby thoroughfare in the cartographic data intersects with athoroughfare on which the device is currently traveling.
 42. Anelectronic navigational aid device with an automatic next turn page,comprising: a processor; a memory adapted to communicate to theprocessor, the memory having cartographic data and a route to a desireddestination stored therein, the cartographic data including dataindicative of thoroughfares of a plurality of types; a display adaptedto communicate with the processor and the memory ard capable ofdisplaying the cartographic data; wherein the device processes travelalong the route; wherein the device provides to the display a presentlydisplayed screen adapted to highlight at least a portion of the routeand display motion of the device on the route; wherein the devicerecognizes when the device is approaching a decision point in the routeand provides to the display an overlay screen on top of the presentlydisplayed screen, such that at least a portion of the presentlydisplayed screen remains visible, the overlay screen adapted to displaya preview of the decision point, including a highlighted portionindicating a course to follow through the decision point, and theoverlay screen displays motion of the device on the course through thedecision point; and wherein the device is adapted to removeinsignificant detail from the geographic detail at the decision pointbased on whether a nearby thoroughfare intersects with a thoroughfare onwhich the device is currently traveling.
 43. The device of claim 42,wherein the overlay screen is provided at a magnified display scale incomparison to a display scale of the presently displayed screen, withthe magnified display scale being dependent on a road classification fora thoroughfare on which the device is currently traveling.
 44. Thedevice of claim 42, wherein the device dynamically provides the overlayscreen to the display in advance of the decision point based at least inpart on a speed at which the device is currently travelling.